WO2020135171A1 - Structure d'antenne et terminal - Google Patents

Structure d'antenne et terminal Download PDF

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Publication number
WO2020135171A1
WO2020135171A1 PCT/CN2019/126190 CN2019126190W WO2020135171A1 WO 2020135171 A1 WO2020135171 A1 WO 2020135171A1 CN 2019126190 W CN2019126190 W CN 2019126190W WO 2020135171 A1 WO2020135171 A1 WO 2020135171A1
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WO
WIPO (PCT)
Prior art keywords
radio frequency
metal plate
spiral radiator
spiral
antenna structure
Prior art date
Application number
PCT/CN2019/126190
Other languages
English (en)
Chinese (zh)
Inventor
简宪静
黄奂衢
王义金
Original Assignee
维沃移动通信有限公司
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by 维沃移动通信有限公司 filed Critical 维沃移动通信有限公司
Priority to EP19904353.0A priority Critical patent/EP3905435B1/fr
Publication of WO2020135171A1 publication Critical patent/WO2020135171A1/fr
Priority to US17/358,297 priority patent/US11955725B2/en

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Classifications

    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01Q—ANTENNAS, i.e. RADIO AERIALS
    • H01Q5/00—Arrangements for simultaneous operation of antennas on two or more different wavebands, e.g. dual-band or multi-band arrangements
    • H01Q5/30—Arrangements for providing operation on different wavebands
    • H01Q5/307—Individual or coupled radiating elements, each element being fed in an unspecified way
    • H01Q5/342—Individual or coupled radiating elements, each element being fed in an unspecified way for different propagation modes
    • H01Q5/357—Individual or coupled radiating elements, each element being fed in an unspecified way for different propagation modes using a single feed point
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01Q—ANTENNAS, i.e. RADIO AERIALS
    • H01Q9/00—Electrically-short antennas having dimensions not more than twice the operating wavelength and consisting of conductive active radiating elements
    • H01Q9/04—Resonant antennas
    • H01Q9/16—Resonant antennas with feed intermediate between the extremities of the antenna, e.g. centre-fed dipole
    • H01Q9/26—Resonant antennas with feed intermediate between the extremities of the antenna, e.g. centre-fed dipole with folded element or elements, the folded parts being spaced apart a small fraction of operating wavelength
    • H01Q9/27—Spiral antennas
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01Q—ANTENNAS, i.e. RADIO AERIALS
    • H01Q1/00—Details of, or arrangements associated with, antennas
    • H01Q1/12—Supports; Mounting means
    • H01Q1/22—Supports; Mounting means by structural association with other equipment or articles
    • H01Q1/2283—Supports; Mounting means by structural association with other equipment or articles mounted in or on the surface of a semiconductor substrate as a chip-type antenna or integrated with other components into an IC package
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01Q—ANTENNAS, i.e. RADIO AERIALS
    • H01Q1/00—Details of, or arrangements associated with, antennas
    • H01Q1/36—Structural form of radiating elements, e.g. cone, spiral, umbrella; Particular materials used therewith
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01Q—ANTENNAS, i.e. RADIO AERIALS
    • H01Q1/00—Details of, or arrangements associated with, antennas
    • H01Q1/50—Structural association of antennas with earthing switches, lead-in devices or lightning protectors
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01Q—ANTENNAS, i.e. RADIO AERIALS
    • H01Q1/00—Details of, or arrangements associated with, antennas
    • H01Q1/52—Means for reducing coupling between antennas; Means for reducing coupling between an antenna and another structure
    • H01Q1/521—Means for reducing coupling between antennas; Means for reducing coupling between an antenna and another structure reducing the coupling between adjacent antennas
    • H01Q1/523—Means for reducing coupling between antennas; Means for reducing coupling between an antenna and another structure reducing the coupling between adjacent antennas between antennas of an array
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01Q—ANTENNAS, i.e. RADIO AERIALS
    • H01Q21/00—Antenna arrays or systems
    • H01Q21/06—Arrays of individually energised antenna units similarly polarised and spaced apart
    • H01Q21/08—Arrays of individually energised antenna units similarly polarised and spaced apart the units being spaced along or adjacent to a rectilinear path
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01Q—ANTENNAS, i.e. RADIO AERIALS
    • H01Q1/00—Details of, or arrangements associated with, antennas
    • H01Q1/12—Supports; Mounting means
    • H01Q1/22—Supports; Mounting means by structural association with other equipment or articles
    • H01Q1/24—Supports; Mounting means by structural association with other equipment or articles with receiving set
    • H01Q1/241—Supports; Mounting means by structural association with other equipment or articles with receiving set used in mobile communications, e.g. GSM
    • H01Q1/242—Supports; Mounting means by structural association with other equipment or articles with receiving set used in mobile communications, e.g. GSM specially adapted for hand-held use
    • H01Q1/243—Supports; Mounting means by structural association with other equipment or articles with receiving set used in mobile communications, e.g. GSM specially adapted for hand-held use with built-in antennas

Definitions

  • the present disclosure relates to the field of communication technology, and in particular, to an antenna structure and terminal.
  • the millimeter wave antennas in the related art mostly use the package antenna (Antenna) technology, which integrates the millimeter wave array antenna, radio frequency integrated circuit (RFIC) and power management integrated circuit (PMIC) into one module.
  • the antenna elements constituting the millimeter wave array are mainly patch antennas, Yagi-Uda antennas, or dipole antennas. These antenna units are relatively narrow-band antennas.
  • conventional patches generally have a relative bandwidth percentage of not more than 8%, but millimeter-wave bands often require dual-frequency or multi-frequency and large bandwidth, which brings great design to the antenna. Challenge.
  • the antenna design of the millimeter wave band needs to use an array to increase the gain of the antenna to compensate for the high path loss and expand the wireless coverage. Therefore, high gain is also an important performance of the millimeter wave antenna array.
  • One of the indicators, in addition to increasing the number of antenna elements, the high-gain array is to design high-gain antenna elements in the array.
  • Embodiments of the present disclosure provide an antenna structure and terminal to solve the related art.
  • the millimeter wave antenna arranged on the terminal occupies more space and is not conducive to miniaturization. And the design challenge of the whole machine integration.
  • an embodiment of the present disclosure provides an antenna structure, including:
  • a metal plate having a first surface and a second surface disposed opposite to each other, an accommodating groove is formed in the metal plate, and the accommodating groove is adjacent to the first surface;
  • the spiral radiator is installed in the accommodating groove, the spiral radiator is insulated from the metal plate, and the spiral radiator is provided with a feeding end for connecting with a feed source.
  • an embodiment of the present disclosure provides a terminal, including:
  • An antenna structure the antenna structure is the above-mentioned antenna structure, and the metal plate is grounded;
  • a radio frequency module located on the second surface of the metal plate, and the radio frequency module is electrically connected or coupled to the feeding end of the spiral radiator.
  • the antenna structure of the embodiment of the present disclosure uses a spiral radiator, so that the terminal adopting this antenna structure realizes circular polarization, can receive incoming waves of any polarization, and reduces the probability of disconnection, thus ensuring the stability of wireless communication , And achieve broadband coverage, and high antenna gain. Moreover, integrating the spiral radiator onto the metal plate also reduces the space occupied by the antenna structure on the terminal. Therefore, the embodiments of the present disclosure solve the design of the millimeter wave antenna arranged on the terminal occupying more space in the related art to achieve multi-band, large bandwidth, and high gain, which is not conducive to miniaturization and integration of the whole machine challenge.
  • FIG. 1 shows a schematic structural view of a planar spiral radiator in an embodiment of the present disclosure
  • FIG. 3 shows a schematic structural view of a case where the accommodating groove serves as a reflector of a spiral radiator in the embodiment of the present disclosure
  • FIG. 5 shows one of the structural schematic diagrams of the antenna structure of the embodiment of the present disclosure
  • FIG. 6 shows a schematic structural view of opening a feed hole in an accommodating slot in an embodiment of the present disclosure
  • FIG. 7 shows a schematic structural view of a feed thimble provided on a radio frequency module in an embodiment of the present disclosure
  • FIG. 8 shows a schematic diagram of the arrangement of a radio frequency integrated circuit and a power management integrated circuit on a radio frequency module in an embodiment of the present disclosure
  • FIG. 9 shows a schematic diagram of the assembly of the radio frequency module and the metal frame in the embodiment of the present disclosure.
  • FIG. 10 is a second structural schematic diagram of an antenna structure according to an embodiment of the present disclosure.
  • FIG. 11 shows one of the structural schematic diagrams of opening the accommodating groove in the metal plate in the embodiment of the present disclosure
  • FIG. 13 is a second structural schematic diagram of a receiving groove formed in a metal plate in an embodiment of the present disclosure
  • FIG. 14 is a second structural schematic diagram of a spiral radiator fixed to a radio frequency module in an embodiment of the present disclosure
  • FIG. 15 shows a schematic diagram of the installation position of the antenna structure on the terminal in the embodiment of the present disclosure.
  • an antenna structure As shown in FIG. 5, the antenna structure includes:
  • a metal plate 1 the metal plate 1 has a first surface and a second surface which are arranged opposite to each other;
  • the spiral radiator 2 is installed in the accommodating groove 3, the spiral radiator 2 is insulated from the metal plate 1, and the spiral radiator 2 is provided with a feeding end for connecting with a feed source.
  • the isoelectric characteristic parameter has a characteristic that the electrical characteristic does not change much in a relatively wide frequency range, realizes circular polarization, receives incoming waves of arbitrary polarization, reduces the probability of wireless communication disconnection, and solves the multi-band, large-scale
  • the spiral radiator 2 is a planar spiral radiator, that is, the structures constituting the spiral radiator 2 are located in the same plane.
  • the spiral radiator 2 may be an Archimedes spiral radiator. Since the planar spiral radiator 2 is a self-symmetrical gradient structure, its electrical characteristics such as pattern, antenna gain, and input impedance do not change much in a wide frequency range, so it is easier to achieve broadband coverage.
  • the orthographic projection of the spiral radiator 2 on the metal plate 1 is substantially circular or substantially square, and the accommodating groove 3 is adapted to the spiral radiator 2, thereby, the spiral radiator 2 can be easily processed and manufactured, and is beneficial to The spiral radiator 2 is installed in the accommodating groove 3.
  • the spiral radiator 2 is a planar spiral radiator and the orthographic projection on the metal plate 1 is substantially circular
  • the structure of the spiral radiator 2 is shown in FIG. 1.
  • the circular planar spiral radiator includes a first radiation arm 00 and a second radiation arm 01, and a feeding position 03 is provided on the first radiation arm 01 and the second radiation arm 02, respectively.
  • the distance Sa between the two spirals of the planar spiral radiator 2 may be equal or different.
  • the spacing Sa between the two spirals of the planar spiral radiator 2 is equal, so that the antenna efficiency of the planar spiral radiator 2 is higher.
  • the maximum radiation direction of the circular planar spiral radiator 2 is at both ends perpendicular to the normal direction of the spiral plane (that is, the arrows A and B shown in FIG. 2 indicate Direction), because the planar spiral radiator 2 is a self-symmetrical gradient structure, its electrical characteristics such as pattern, antenna gain, and input impedance do not change much within a relatively wide frequency range, so it is easier to achieve broadband coverage. Therefore, it can effectively solve the design problems of multiple frequency bands and large bandwidths, and realize circular polarization, which can receive incoming waves of arbitrary polarization to reduce the probability of disconnection and ensure the stability of wireless communication.
  • the embodiments of the present disclosure solve the design of the millimeter wave antenna arranged on the terminal occupying more space in the related art to achieve multi-band, large bandwidth, and high gain, which is not conducive to miniaturization and integration of the whole machine challenge.
  • the planar spiral radiator 2 may also be a part of the metal plate 1, that is, a part of the metal plate 1 is processed into a planar spiral form to constitute a radiator.
  • Using part of the metal plate 1 as the spiral radiator 2 can increase the bandwidth of the antenna and cover multiple frequency bands. Further, when the metal plate 1 is used as a part of the metal shell of the mobile terminal, using a part of the metal shell as the spiral radiator 2 can reduce the occupation space of the antenna without affecting the metal texture of the terminal.
  • an insulating dielectric member is provided between the spiral radiator 2 and the metal plate 1. That is, the accommodating groove 3 is filled with an insulating medium, and the spiral radiator 2 is fixed on the insulating medium. Further, the spiral radiator 2 is fixed inside or on the surface of the insulating dielectric member.
  • the dielectric material can choose low dielectric constant and low loss dielectric materials.
  • FIGS. 5 and 6 there are a plurality of accommodating grooves 3, the plurality of accommodating grooves 3 are arranged at intervals, the spiral radiator 2 is a plurality corresponding to the accommodating groove 3, and the plurality of spiral radiators 2 correspond one-to-one Installed in a plurality of accommodating grooves 3, such as shown in Figures 5 and 10.
  • a spiral radiator 2 is installed in one accommodating groove 3, so that each spiral radiator 2 is isolated from each other, increasing the isolation between the radiators, thereby reducing the coupling between the spiral radiators 2 .
  • the depth of the accommodating groove 3 is less than or equal to the thickness of the metal plate 1. That is, the accommodating groove 3 may be through the metal plate 1 or not through the metal plate 1.
  • the accommodating groove 3 may form a spiral when grounded (that is, the metal plate 1 is grounded)
  • the reflector 11 of the radiator 2 is shown in FIG. 3. It can be seen from the comparison between FIG. 2 and FIG. 4 that after the reflector 11 is added to the spiral radiator 2, the maximum radiation direction is perpendicular to the spiral plane (ie, the direction indicated by the arrow A in FIG. 4), that is, vertical In the direction of the spiral plane and away from the reflector 11.
  • the spiral radiator 2 can be compared with the environment in the system behind the metal plate 1 Not sensitive, so more devices can be integrated to achieve more functions, thereby enhancing the competitiveness of the terminal.
  • An embodiment of the present disclosure also provides a terminal, the terminal including:
  • the antenna structure is the above antenna structure
  • the radio frequency module is located on the second surface of the metal plate 1.
  • the radio frequency module is electrically connected or coupled to the feeding end of the spiral radiator 2.
  • the radio frequency module is used to provide a radio frequency signal, and after the radio frequency module is electrically connected or coupled to the feeding end of the spiral radiator 2, the radio frequency signal output by the radio frequency module can be transmitted to the spiral radiator 2.
  • the radio frequency module may also be provided inside the system of the terminal.
  • the depth of the accommodating groove 3 provided on the metal plate 1 is less than or equal to the thickness of the metal plate 1. That is, the accommodating groove 3 may be through the metal plate 1 or not through the metal plate 1.
  • this groove can form the reflector 11 of the spiral radiator 2, as shown in FIG. 3. It can be seen from the comparison between FIG. 2 and FIG. 4 that after the reflector 11 is added to the spiral radiator 2, the maximum radiation direction is perpendicular to the spiral plane (ie, the direction indicated by the arrow A in FIG. 4), that is, vertical In the direction of the spiral plane and away from the reflector 11.
  • the accommodating groove 3 can form the reflector 11 of the spiral radiator 2, then the spiral radiator 2 can be less sensitive to the environment in the system behind the metal plate 1, so it can be integrated more Multiple devices realize more functions, thereby enhancing the competitiveness of products.
  • a feeding thimble 6 is provided on the radio frequency module, and the feeding thimble 6 is electrically connected to the feeding end.
  • a feeding hole 7 is provided on the accommodating slot 3, and the feeding thimble 6 is electrically connected to the feeding terminal through the feeding hole 7.
  • the arrangement of the feeding hole 7 is specifically shown in FIG. 6. That is, the RF module is closely attached to the metal plate 1, so that the feed thimble 6 is fed into the spiral radiator 2 through the feed hole 7, so that the signal path is the shortest, effectively reducing the path loss, thereby improving the quality of wireless communication .
  • the feed hole is located On the insulating dielectric member in the accommodating groove 3; when the depth of the accommodating groove 3 is less than the thickness of the metal plate 1 (that is, the accommodating groove 3 does not penetrate the metal plate 1), and the spiral radiator 2 and the metal plate 1 are provided
  • the feed hole includes a first feed hole located at the bottom of the accommodating slot 3 and a second feed hole located on the insulating dielectric member, then the feed thimble 6 passes through the second feed hole and the second A feeding hole is electrically connected with the spiral radiator 2.
  • a feed hole is formed in the insulating dielectric member due to the feed thimble in the accommodating groove 3 during injection molding.
  • the plurality of accommodating grooves 3 are arranged at intervals, the spiral radiator 2 is a plurality corresponding to the accommodating groove 3, and the plurality of spiral radiators 2 are installed in a plurality of It is placed in the slot 3, and the distance between two adjacent spiral radiators 2 is equal to half the wavelength of the operating frequency of the antenna structure.
  • a plurality of spiral radiators 2 form an array antenna, and can achieve multi-band coverage performance.
  • the array antenna composed of the spiral radiator 2 can maintain the same or close performance in the spatial symmetry or mapping direction when the beam is scanned.
  • the distance between two adjacent spiral radiators 2 is equal to half the wavelength of the operating frequency of the antenna structure. Specifically, when the spiral radiators 2 are spaced apart along the length of the metal plate 1, the distance is specifically the distance between adjacent spiral radiators 2 in the length direction of the metal plate 1; when the spiral radiation 2 is along the width of the metal plate 1 When the direction interval is set, the distance is specifically the distance between adjacent spiral radiators 2 in the width direction of the metal plate 1.
  • the radio frequency module includes a radio frequency integrated circuit 504 and a power management integrated circuit 505, and the radio frequency integrated circuit 504 is electrically connected to the feed terminal and the power integrated circuit, respectively.
  • the radio frequency module can also be provided with a BTB connector 506, which is used for the intermediate frequency signal connection between the radio frequency module and the terminal main board.
  • the radio frequency module further includes a first ground layer 501, a second ground layer 502, and an insulating dielectric layer 503.
  • the insulating dielectric layer 503 is located between the first ground layer 501 and the second ground layer 502, and the radio frequency integrated circuit 504 and
  • the power management integrated circuit 505 is disposed on the second ground layer 502, the radio frequency integrated circuit 504 is electrically connected to the feeding end of the spiral radiator 2 through the first trace, and the radio frequency integrated circuit 504 is electrically connected to the power management integrated circuit 505 through the second trace
  • the first trace and the second trace are distributed in the insulating dielectric layer 503. Wherein, placing the radio frequency integrated circuit 504 on the ground layer of the radio frequency module can minimize the loss of the antenna signal on the path.
  • the first ground layer 501 of the radio frequency module may form the reflector of the spiral radiator 2.
  • the feeding thimble is provided on the first ground layer 501.
  • the feed thimble is located in the insulating dielectric layer 503, and is electrically connected to the RF contact circuit on the second ground layer 502 through the wiring in the insulating dielectric layer 503, and the first ground layer 501 is provided with a first via
  • the diameter of the first via is larger than the diameter of the feed thimble, that is, the feed thimble is located in the first via, but does not contact the first formation 501.
  • the radio frequency module shown in FIG. 8 is placed on the second surface of the metal plate 1 so that the feed thimble passes through the feed hole in the accommodating slot 3 and is electrically connected to the spiral radiator 2.
  • the effect after the radio frequency module shown in FIG. 8 is installed on the metal plate 1 shown in FIG. 6 is shown in FIG. 9.
  • the spiral radiator 2 can also be disposed on the radio frequency module, that is, as shown in FIGS. 12 and 14, a plurality of insulating members 8 are spaced apart on the first ground layer 501 of the radio frequency module, and one is fixed on one insulating member 8
  • the spiral radiator 2 is provided with a plurality of accommodating grooves 3 (as shown in FIGS. 11 and 13) penetrating the metal frame on the metal frame, so that the insulating member 8 is embedded in the accommodating groove 3. That is, the spiral radiator 2 and the insulating dielectric member 4 in the accommodating groove 3 in the foregoing solution are integrated as a protruding component on the radio frequency module, and a correspondingly shaped hole is cut in the metal plate 1 so that the radio frequency module protrudes. Just embedded in these holes, to achieve the purpose of positioning limit.
  • the shape of the accommodating groove 3 is circular
  • the insulating member 8 provided on the first ground layer 501 of the radio frequency module is circular
  • FIGS. 11 and 12 when the orthographic projection of the spiral radiator 2 on the metal plate 1 is substantially square, the shape of the accommodating groove 3 is square, and the insulating member 8 provided on the first ground layer 501 of the RF module is Square, as shown in Figures 13 and 14.
  • the terminal has a housing, at least part of the housing is a metal shell, and the metal plate 1 is the first part of the metal shell.
  • the metal shell includes a first frame 101, a second frame 102, a third frame 103, a fourth frame 104, and a metal middle shell.
  • the first to fourth frames 104 surround a system ground 9, the system ground It may be composed of a PCB board, and/or a metal middle shell, and/or an iron frame on the screen, etc.
  • the spiral radiator 2 may be integrated on the metal frame enclosed by the broken line in FIG. 15.
  • the spiral radiator 2 is integrated on the metal shell of the terminal, which reduces the space occupied by the spiral radiator 2 on the terminal.
  • the metal plate 1 is not limited to being a part of the metal shell, but also a part of the target antenna radiator on the terminal, the working frequency band of the target antenna radiator and the working frequency band of the spiral radiator 2 different. That is, the spiral radiator 2 can also be integrated on other antenna radiators on the terminal.
  • the above-mentioned first part is a side part and/or a back part of the metal shell.
  • the first part when the first part is the side part of the metal shell, it can avoid the back of the terminal from being blocked by the metal table when the terminal is placed upright (that is, when the screen is facing upward), and can also prevent the spiral radiation in the case of holding it.
  • the antenna performance of the body 2 is greatly reduced.
  • the radio frequency module is a millimeter wave radio frequency module.
  • the millimeter wave antenna is integrated into the metal frame, and part of the metal frame serves as the radiating plate of the millimeter wave antenna, which can increase the bandwidth of the millimeter wave antenna and can cover multiple frequency bands of 5G millimeter wave, while not Affect the metal texture of mobile terminals, which can enhance the broadband wireless experience of users in multiple millimeter wave bands when roaming across the country or even globally.
  • the number, position, shape, size, angle, pitch, arrangement, communication frequency band, implementation, etc. of the spiral radiator in the present disclosure are not limited to those described in the embodiments.
  • Other applications and designs based on the basic mentality of this patented invention are within the scope of this patent protection.

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  • Engineering & Computer Science (AREA)
  • Microelectronics & Electronic Packaging (AREA)
  • Aerials With Secondary Devices (AREA)
  • Details Of Aerials (AREA)

Abstract

La présente invention concerne une structure d'antenne et un terminal, la structure d'antenne comprenant : une plaque métallique, la plaque métallique comprenant une première surface et une seconde surface qui sont disposées face à face l'une de l'autre, la plaque métallique comprenant une rainure de réception, et ladite rainure de réception étant adjacente à la première surface; et un élément rayonnant en spirale, l'élément rayonnant en spirale étant monté dans la rainure de réception, l'élément rayonnant en spirale et la plaque métallique sont isolés l'un de l'autre, et l'élément rayonnant en spirale comporte une extrémité d'alimentation utilisée pour se connecter à une alimentation.
PCT/CN2019/126190 2018-12-27 2019-12-18 Structure d'antenne et terminal WO2020135171A1 (fr)

Priority Applications (2)

Application Number Priority Date Filing Date Title
EP19904353.0A EP3905435B1 (fr) 2018-12-27 2019-12-18 Structure d'antenne et terminal
US17/358,297 US11955725B2 (en) 2018-12-27 2021-06-25 Antenna structure and terminal

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
CN201811616012.1 2018-12-27
CN201811616012.1A CN109728413B (zh) 2018-12-27 2018-12-27 天线结构及终端

Related Child Applications (1)

Application Number Title Priority Date Filing Date
US17/358,297 Continuation US11955725B2 (en) 2018-12-27 2021-06-25 Antenna structure and terminal

Publications (1)

Publication Number Publication Date
WO2020135171A1 true WO2020135171A1 (fr) 2020-07-02

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US (1) US11955725B2 (fr)
EP (1) EP3905435B1 (fr)
CN (1) CN109728413B (fr)
WO (1) WO2020135171A1 (fr)

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US11955725B2 (en) 2024-04-09
US20210320411A1 (en) 2021-10-14
EP3905435B1 (fr) 2024-05-01
EP3905435A1 (fr) 2021-11-03
CN109728413A (zh) 2019-05-07
EP3905435A4 (fr) 2022-02-16

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